(19)

(11)

EP 2 501 899 A1

(12)

(43) Date of publication: 26.09.2012 Bulletin 2012/39 (21) Application number: 10830955.0 (22) Date of filing: 19.11.2010

(51) International Patent Classification (IPC):  E21B 49/02(2006.01) E21B 43/34(2006.01) E21B 47/04(2012.01) E21B 49/08(2006.01) (86) International application number: PCT/AU2010/001549 (87) International publication number: WO 2011/060494 (26.05.2011 Gazette 2011/21)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 19.11.2009 AU 2009905663 (71) Applicant: Gray, Ian Acacia Ridge, Queensland 4110 (AU)	(72) Inventor: Gray, Ian Acacia Ridge, Queensland 4110 (AU) (74) Representative: Walker, Ross Thomson  Forresters Skygarden Erika-Mann-Strasse 11 80636 München 80636 München (DE)